Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier.

Accordingly, differences between the second part of the night (when migrating passerines are mostly engaged in cruising flight) and the first or third parts of the night (when, during migration, passerines are taking off and landing, respectively) were highly significant during migration seasons: t(1–2) = 4.7, p(1–2) < 0.00001, t(2– 3) = 7.4, and p(2–3) < 0.00001.

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